Instruction Manual
Detailed Setup
September 2013
4-9
Pressure Tuning (1-2-2-1-3)
WARNING
Changes to the tuning set may cause
the valve/actuator assembly to stroke.
To avoid personal injury and property
damage caused by moving parts,
keep hands, tools, and other objects
away from the valve/actuator
assembly.
Pressure Tuning Set—There are twelve
Pressure Tuning Sets to choose from. Each tuning set
provides a preselected value for the digital valve
controller gain settings. Tuning set C provides the
slowest response and M provides the fastest
response.
Tuning set B is appropriate for controlling a pneumatic
positioner. Table 4-6 lists the proportional gain,
pressure integrator gain and minor loop feedback gain
values for preselected tuning sets.
In addition, you can specify Expert tuning and
individually set the pressure proportional gain,
pressure integrator gain, and pressure minor loop
feedback gain. Individually setting or changing any
tuning parameter will automatically change the tuning
set to X (expert).
Note
When selecting a tuning set for a
DVC6015, DVC6025 or DVC6035 remote
mount unit, it may be necessary to
reduce the tuning set, due to the
effects of the long tubing between the
digital valve controller and the
actuator.
Table 4-6. Gain Values for Preselected Pressure Tuning Sets
Tuning
set
Pressure
Proportional Gain
Pressure
Integrator
Gain
Pressure
Minor Loop
Feedback Gain
B
C
D
E
F
G
0.5
2.2
2.4
2.8
3.1
3.6
0.3
0.1
0.1
0.1
0.1
0.1
35
35
35
35
35
34
H
I
J
K
L
M
4.2
4.8
5.6
6.6
7.8
9.0
0.1
0.1
0.1
0.1
0.1
0.1
31
27
23
18
12
12
X
(Expert)
User Adjusted User Adjusted User Adjusted
Note
Use Expert tuning only if standard
tuning has not achieved the desired
results.
Stabilize/Optimize and performance
tuner may be used to achieve the
desired results more rapidly than
Expert tuning.
Integral Enable—Yes or No. Enable the
pressure integral setting to improve static performance
by correcting for error that exists between the
pressure target and actual pressure. Pressure Integral
Control is disabled by default.
Integral Gain—Pressure Integral Gain (also
called reset) is the gain factor applied to the time
integral of the error signal between desired and actual
pressure. Changing this parameter will also change
the tuning set to Expert.
4